Designed to be resistant to vibration and other external stresses that can damage the filament of a regular lamp, this 100/89W rough service incandescent lamp features an A19 shape, medium screw base, inside frost finish, 2800K color temperature, 1070/813 initial lumens and 2000/5400 hour average life. Meets 2012 Lighting Legislation Energy standards. 2-3/8" diameter x 3-15/16"OAL.